Richms, we also have the ones in your link and they do only work with thicker strands like mains TPE wiring, not fine strands, because you have to push the wire into the contact.  The ones I've linked however do not work the same, they have a lever you lift, insert the wire, then drop the lever.  They are awesome even on fine strands, which is where we use them.  To remove, lift the level and pull out.  It is a ZIF connector (zero insertion force).